2.1.1. Aluminium Reinforced with Alumina (Al/Al2O3)
Aluminium oxide, also known as Alumina, particulate reinforced aluminum composites and has outstanding mechanical characteristics such as high strength-to-weight ratio, better tribological characteristics, and excellent cast-ability over the base materials. So, it is considered one of the most productive MMCs available to date [
14]. Compressive residual stress is noticed during the machining of Al/Al
2O
3, and the amount of residual stress has risen three times by conventional machining. The softened matrix is readily squeezed out of the machined surface, whereas
Al2O3 particles are forced in from the machined surface, resulting in a larger concentration of Al2O3 particles in the surface layer.
To improve the surface finish and the force of cutting during the machining of AA7039/Al
2O
3 MMCs, a systematic approach comprising testing and analysis is applied utilizing Taguchi, ANOVA, and ANN [
15]. Another experiment was carried out utilizing LM6 Al alloy with Al
2O
3 and a comparison was done using TiN-coated and uncoated tools [
16] found that the NCD-coated tool performed superior with a less cutting force and specific cutting energy.
Most of recent reported studies forcus on machinability and machining optimization of Al/Al
2O
3. For instance, FEM simulations were performed by [
17] using Al6061 with Al
2O
3 to predict forces and the comparison was done between FE data and experimental data. Machinability investigations were done on Al 7075/BN/Al
2O
3 squeeze cast hybrid nanocomposite under diverse machining environments, and to examine the impacts of various cutting settings to reduce forces, tool wear, and surface roughness [
18]. In addition, experimental research was performed by [
19] to analyze the machinability of turning AA2014 with Al
2O
3 to access surface finish, tool wear, temperature, and cutting forces using linear regression analysis and the Taguchi technique. The mathematical model was created using DOE and optimization was done using RSM, ANOVA to turn the LM25 aluminum alloy with Nano Al
2O
3 to reduce surface roughness and cutting force [
20].
The researchers in [
21] optimized MRR, surface roughness, and tool flank wear using RSM of A359/B4C/Al
2O
3 hybrid MMCs material in turning operation. A comparison of two SNGN ceramic tools turning experiment was done utilizing EN AC-44000 AC-AlSi11 with Al
2O
3 to minimize cutting forces, tool wear, and surface roughness [
22]. Experimental investigation employing Al7075 with enhanced weight percentages of nano-sized SiC and Al
2O
3 using the Taguchi approach to optimize machining force and surface roughness reported in [
23]. The researchers in [
24] estimated the cutting force and surface roughness of A356/Al
2O
3 aluminum nano-composites during milling and specified that greater reinforcement ratios can improve the surface quality. To reduce tool wear the technique used by [
25] used a CCD milling model utilizing Al 6061 reinforced Al
2O
3 and graphite (Gr), and the optimization was carried out using ANOVA and SEM analysis.
2.1.2. Aluminium Reinforced with Silicon (Al/Si)
Silicon is commercially manufactured through the reduction of sand and carbon in an electric furnace. High-purity silicon for the electronics sector is produced by thermal breakdown of ultra-pure trichlorosilane, followed by recrystallization. Nowadays, researchers have conducted a remarkable study on the combination of aluminum and silica to develop a hybrid composite with increased mechanical characteristics. Some of the MMCs are:
Al reinforced with silicon carbide (SiC),
Al reinforced with silicon carbide and graphite (SiC-Gr),
Al reinforced with silicon and magnesium (Al-Si10Mg),
Al reinforced with silicon (Si),
Al reinforced with silicon and aluminium oxide (Si-Al2O3),
Al reinforced with silicon nitride and graphene (Si3N4 and C) ,
Al reinforced with silicon and multi-wall carbon nanotubes (SI-MWCNT),
Al reinforced with silicon nitride and molybdenum disulfide (SiN - MoS2), and
Al reinforced with Silicon with magnesium (AlSi9Mg).
Silicon carbide materials offer exceptional qualities, including high thermal rigidity and resistance to creep, wear, and oxidation. Al/SiC metal matrix composites have poor machinability, a high tool wear rate, a fast worn cutting edge, and surface finishing that is undesirable and considerably harder than WC tool material [
26].
Experimental investigation was done to determine tool wear, flank wear, tool life, and spindle power consumption using the X-ray diffraction method of Al/SiC material [
27]. The surface quality, pits, voids, micro cracks, grooves, and protuberances of SiC/2024Al and SiC/ZL101A are evaluated in the turning operation using SEM approach in [
28,
29]. The researchers in [
30,
31] performed a milling experiment utilizing Al061/SiC to minimize surface roughness and tool force, and optimization was carried out using ANOVA, RSM, and ANN. A drilling experiment was carried out using Al356/SiC-mica composites to evaluate the thrust force, surface roughness, tool wear, and burr height using Taguchi method and GRA [
32], Taguchi method [
33] and RSM [
34]. The researcher in [
35] investigated the machinability and influence of particle size, in which Al356/SiC was synthesized using the vacuum hot-pressing process. The Box-Behnken-based design of the experiment approach was used to calculate cutting force and surface quality [
35], RSM approach was used by [
36]. Taguchi and DFA approach were used to mill Al356/SiC/B4C to estimate surface quality and force [
37].
The author in [
38] carried out a milling experiment with SiC/Al 6063 composite material to predict cutting force using ANOVA and RSM techniques. The turning experiment on fabricated SiC reinforced A356 aluminium metal matrix was presented by [
39], and surface roughness was predicted using RSM, ANOVA, and the DFA approach. The author in [
40] carried out an experiment using SiC and B4C reinforced Aluminium 356 hybrid MMCs. The experiment was designed and optimized using RSM. The surface roughness was anticipated during the turning of Al/SiC composites using the Taguchi approach by [
41]. The researchers in [
42,
43] predicted tool wear, surface roughness, and MRR using ANOVA, Taguchi, and RSM methodologies of aluminum with Si, Mg, Fe reinforced with SiC in nano size. The machinability tests to forecast cutting forces, tool wear, and surface roughness of an aluminum-silicon cast alloy were conducted during a turning operation [
44]. In order to estimate milling force and tool wear of Al7075 and the open-cell SiC foam MMCs [
45] conducted an experimental investigation and the results were anticipated using ANOVA and RSM.
Some studies focused on developing FE model to investigate the A359/SiC MMCs cutting force components. For instance, the auther in [
46,
47] developed design of trials using Taguchi developed a microstructure-based finite element model [
48]. The author in [
49] used SEM and TEM to examine the tool wear of an aluminum alloy, AlSi9Mg0.3, reinforced with SiC particles. The authors in [
50] carried out an experimental investigation to quantify tool flank wear and surface roughness using fuzzy logic and Al/SiC MMCs. The CCD experiment was applied by [
51] using A356-T6 alloy reinforcement with SiC to predict surface roughness and cutting forces, surface roughness and tool wear [
52]. SiC/Al composites chip formation process was studied using FE simulations to show how reinforced particles affect tool wear and surface quality [
53]. The researcher in [
54] examined the Al6063/SiC/65p composites' machinability in end milling to forecast cutting forces, deformation of thin-walled components, surface integrity, and tool wear.
Milling experimental work was conducted by [
55] to measure surface roughness of Al 6061 MMCs reinforced with irregular shape SiC particles. The cutting force, surface integrity, chip formation, and tool wear of laser-assisted micro milling of Al2024/SiC composites technique were measured in this experiment, which was executed using the Taguchi method and evaluated using ANOVA [
56]. In order to quantify stress/strain distribution, tool-particle interaction, and machined surface morphology [
57] compared micro and Nano MMCs of Al/SiC MMCs using simulation models by assuming 3D micro milling process to 2D micro-orthogonal machining process. Using the ultrasonic cavitation aided casting process, Al7075 filled SiC and B4C were created to increase the better mechanical qualities and more fine grain architectures [
58].
The author in [
59] used FEM and RSM techniques to determine the surface generation in connection to the process factors and important basic concerns by examining SiC/Al and B4C/Al MMCs and comparing the findings. The Al6061/SiC/B4C/talc are formed into composites by the stir casting method in a constant weight % to forecast surface roughness, thrust force, and circularity with the Taguchi methodology, ANOVA, and GRA [
60]. At varying weight percentages, aluminum with Nano SiC were concurrently melted and preheated. RSM was used to monitor and adjust the temperature and grinding forces [
61]. The author in [
62] developed an experiment to improve machining parameters such as surface roughness and flank wear by utilizing the Taguchi and Placket-Burman methods of aluminum reinforced with SiC particles. Tool wear was analyzed by [
63] of Al6063 reinforced with equal weight fraction of SiC and zirconia (ZrO
2) was fabricated using stir casting process.
According to the researchers in [
64,
65] the reinforcement particles SiC, B4C, graphene, and CNT with Al7075 have a greater impact on chip morphology and shape. To quantify surface roughness [
66] machined LM24-SiC-coconut shell ash in a turning process using an optimal Taguchi approach and genetic algorithm. The impact of laser-assisted micro-cutting on tool wear, surface roughness and surface morphology of SiC/Al MMCs were discussed by [
67]. Due to high hardness of SiC , temperature, chip shape, and surface roughness are all enhanced in machining MMCs when SiC and Al are together, and this is the main reason for tool failure [
68]. Using Taguchi technique and ANOVA, the numerical model was utilized to simulate the workpiece temperature, feed rate, and surface roughness of Al-SiC composite [
69]. Through investigation of the drilled holes' thrust force, hole diameter, delamination factor, surface roughness, tool wear, and chip analysis, it was found that the thrust force of Al/SiC varies inversely with spindle speed and directly with feed rate [
70].
The researchers [
71,
72] developed a multilayer perceptron (MLP) artificial neural network (ANN) models to forecast tool wear during Al/SiC milling. In micro milling machining of SiC/Al composites, SiC particles result in fast abrasive wear on the cutting tool [
73,
74]. The Levenberg-Marquardt back propagation training method and ANOVA were used to optimize parameters of Al/SiC material during milling, and the creation of built-up edge (BUE) was an essential phenomenon that affected roughness [
75]. The analytical modeling method was utilized to forecast the SSD depth in the cutting of SiC/Al composites with great accuracy across a wide range of tool wear [
76]. The metallographic investigation of the SiC material was done to examine the high percentage of reinforcement, and extremely high micro hardness values were recorded during the machining process [
77].
The author in [
78] investigated the machining of Al/SiC MMCs using the Taguchi technique and Principal Component Analysis (PCA) to optimize cutting forces and flank wear; while [
79] used the Taguchi and Quadratic Regression models. The author in [
80] carried out a study using Al 7075 / SiC to assess tool temperature, surface roughness, and tool flank wear employing ANOVA, Taguchi, and PSO. The researcher in [
81], as predicted using ANOVA and RSM, show that depth of cut influences tangential force, while feed rate influences feed force during the turning of Al 7075 /SiC composite. On the other hand, enhancing cutting speed and feed improves flank and crater wear [
82]. FESEM, EDAX, AFM, and Vickers micro hardness tests were used to evaluate the subsurface deformation and morphology of Nano SiC/Al composites. The NSGA-II was utilized to improve surface roughness and burr height [
83].
During machining of Al2024/B4C/SiC composites, reinforcement particles fill the matrix pores, leading to improved performance [
84]. The RSM, ANOVA, and DFA methods are utilized to enhance the machinability properties of hybrid Al7075/SiC/Gr composites [
85]. The steady increase in SiC reinforcement particles on Al4032 improves various mechanical parameters while also causing quick tool wear and high machining costs. The optimization was done using TGRA and ANOVA [
86], Taguchi and ANN [
87], and RSM [
88]. The suitable spindle speed, flow rate, and cut length achieve the lowest tribological characteristics during the turning of the Al7071/SiC composite [
89].
The Al/SiC/Cr composite material is produced using the stir casting process, and the Taguchi GRA and ANOVA methods were used to optimize surface roughness, MRR, and TWR [
90]. The author in [
91] stated that the micro hardness and strength increased by 7.14% and 8.62%, as compared to the basic Al alloy while adding 10% SiC particles in the base matrix and that the inclusion of Mo with SiC showed a significant rise in the hardness value. During the examination of SiC/Al
2O
3 and aluminum powder using the Taguchi technique [
92] found that the cutting speed and depth of cut have the greatest impact on surface roughness and cutting force [
93] constructed a FE model and mounted an EVAC device on a CNC machining machine to turn SiC/Al composites to measure the cutting force and surface topography. The authors in [
94] performed an experimental investigation utilizing Al6061 alloy with SiC reinforcement and concluded that hole diameter affects localized stress and chip breakability. A novel tool wear rate model created out to machine SiC/Al composite material, taking into account abrasive particle properties, tool wear processes, and tool geometrical structure, was presented to represent the whole tool wear topography in drilling [
95].
The researcher in [
96] produced an Al7075 reinforced with SiC/ WC utilizing stir casting technology. The optimization was performed using RSM, MLR, ANN, and DFA. The author in [
97] used the RSM approach to observe the surface peak of Al7075/SiC. The prediction models were constructed in turn using Taguchi and RSM and concluded that the creation of wear is caused by abrasion between the aluminum, silicon, magnesium, copper, and silicon carbide reinforcing particles [
98]. The comparative research employing ultrasonically aided turning and conventional turning experiments was designed using FE software ABAQUS to turn 217 XG, 225XE aluminum reinforced with SiC, and the findings were confirmed using 3D macroscopic numerical modeling [
99]. The features of the composite were reduced when the reinforcement was raised further during the investigation of Al7075 alloy with nano-sized SiC and Al2O3 utilizing the Taguchi approach [
23].
The authors in [
100,
101] investigated the tribological and machining properties of milling SiC/Al MMCs using EDS microscopic examination. The weight percentage of nanoparticles had the greatest influence on the cutting force, as stated by [
102,
103] constructing a lineal model and optimizing utilizing RSM of Al-6061-SiC-Gr hybrid Nano composites. Spindle speed and feed rate, as well as the weight % of reinforced materials, have a substantial effect on the surface integrity of hybrid Al7075/SiC/Gr composites [
104].
The Al-Si10Mg alloy was produced using an automated stir-casting machine to optimize cutting force and surface roughness [
105]. The failure mechanism of primary silicon particles dominates damage development, which includes compressive breakage, intra granular fracture, particle pull-out, and interface debonding of silicon aluminum composite (Si/Al) [
106]. The author in [
107] performed the machinability study to test the performance of the Al-12Si based hybrid reinforced (TiB2-Al
2O
3) composite employing environmentally friendly cooling materials: cryo-LN2 in milling. The author in [
108] used the Taguchi approach and ANOVA to optimize the MRR, surface roughness, and roundness error during the turning of Al-Si/Al2O3 and Al-Si/MWCNTs manufactured by stir casting.
Aluminum composite including Si3N4 particles and graphene was manufactured using ultrasonic aided stir-casting technology to assess tool wear, surface roughness, and cutting force utilizing LSOA, MOORA, and TLBO employing turning process [
109]. The Al6065-Si-MWCT MMC is reinforced using the stir-casting technique. The turning experiment was designed using DOE, ANOVA, and RSM [
110]. The presence of SiN is found to enhance the force, surface roughness, and tool wear, and the reinforcement % percentage of Al 2219 based Nano particles of SiN/MoS
2 is the main regulating factor for machinability properties [
111]. The study reported in [
112] produced aluminum metal matrix nano (n-B4C) and nano hybrid composites (n-B4C/MoS
2) utilizing the stir casting process to detect surface roughness and cutting force using CCD in turning operation. The research reported in [
113] proposed that EN AC-43330 (AlSi9Mg) cast aluminum enhances the machining parameters and quality of the machined workpiece. [Duralcan™ is an aluminum matrix supplemented with ceramic particles like alumina and silicon carbide. The study reported in [
114] adjusted milling settings to obtain the required surface roughness characteristics.
2.1.3. Aluminium Reinforced with Boron (Al-B)
Boron compounds are employed in organic synthesis, the creation of a certain form of glass, and as a wood preservative. Boron filaments are employed in advanced aircraft constructions due to their high strength and lightweight nature. In particular, Boron carbide is one of the hardest ceramic materials, and has high Young's modulus, along with low density, which leads to a strong resistance to ballistic impact [
115]. Nowadays, experts have conducted an amazing study on the mixing of aluminum with chemicals to generate a hybrid composite with increased mechanical capabilities. Some of the MMCs of aluminium reinforced with boron, which are attracting significant interest due to the demand for high-performance materials, are:
Al reinforced with Boron carbide (B4C),
Al reinforced with Magnesium diboride (MgB2),
Al reinforced with Titanium diboride (TiB2),
Al reinforced with Hafnium diboride (HfB2), and
Al reinforced with Zirconium diboride (ZrB2),.
Al6061 is often reinforced with Boron carbide using the stir casting method, and the effects of milling parameters on surface finish and microstructure are calculated on the gear milling process. The inclusion of B
4C alters the characteristics of the composites, influencing the machining parameters [
116]. The author in [
117] conducted an experimental investigation using ANOVA and GRA and determined that increasing the weight fraction of the B
4C resulted in a significant increase in thrust force. The researcher in [
118] conducted a machinability investigation to assess the cutting forces and surface roughness of Al6061 reinforced with
B4C using various machining settings. The research reported in [
119] used machine learning to anticipate and regulate surface roughness produced during the machining of B
4C and MWCNT particles reinforced Al-Mg matrix composites. The experimental study was conducted using AA8050 aluminum alloy with B
4C and TiB
2 nanoparticles to form a hybrid Nano composite material that maximizes MRR while minimizing surface roughness [
120]. The author in [
121]) found that adding B
4C and GNP to an aluminum 6061 alloy matrix improved cutting forces and surface roughness. The research reported in [
122] investigated the effect of various cutting tools, lubrication techniques, and drill geometries on the drilling performance of Alumix 123-B
4C-nickel-coated graphite composites and optimized using the ANOVA approach.
Some of the researchers used Aluminium as a base material and reinforced with Boron materials to conduct experimentation: The research reported in [
21] used A359/B
4C/Al
2O
3 hybrid MMCs, the authors in [
37] and [
40] used Al 356/SiC/B
4C, the researcher in [
59] used Al7075/SiC/B
4C, the researcher in [
60] used SiC/Al and B
4C/Al MMCs, researcher in [
61] used Al6061/SiC/B
4C/talc, the author in [
65,
66] used Al7075/SiC/B
4C / Graphen /CNT, the study reported in [
85] used A 2024 / B
4C / SiC composites, the researcher in [
113] used Al 2219 / nano B4C and nano B
4C /MoS2.